Dental tool for slitting cap-crowns.



No. 70l,6l6. Patented lune 3, |902.

. C. J. REYNOLDS,

DENTAL TOUL FOB SLITTING GAP CROWNS. (Applicatio lad Dec. 27, 1901`) (NoModel.)

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UNITED 'STATES PATENT OFFICE.

CLAYTON J. REYNOLDS, OF PITTSBURG, PENNSYLVANIA.

DENTAL TOOL FOR SLITTING CAP-CROWNS.

SPECIFICATION forming part of Letters Patent No. 701,616, .dated June 3,1902.

Application filed December 2'7, 1901.. Serial No. 87.406. (No model.)

To @ZZ whom, t may concern.:

Beit known that I,v CLAYTON J. REYNOLDS, a citizen of the United States,residing at, Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inDental Tools for Slitting Cap-Crowns, of which thefollowing is aspecification, reference being had therein to the accompanying drawings.

The object of my invention ist'o provide a new and improved dental toolparticularly adapted for slitting gold cap-crowns in the operation ofremoving a crown from a tooth; and to this end my invention consists ofa new and improved crown-slitting tool and in the construction andcombinationl of parts,all as fully hereinafter described and claimed.

In the accompanying drawings, which illustrate an application of myinvention,vFigure 1 is an elevational view of a gold-croWn-slitting toolconstructed in accordance'with my invention. Fig. 2 is adetailed'sectional view of a portion of one jaw; Fig. 3, a similar Viewshowing the adjustable bearing-head in a different position from theposition shown by Fig. 2; Fig. 4, a detailed perspectiveviewparticularly showing the slitting-blade; Fig. 5, a sectional viewshowingmanner of attaching the blade to a jaw; Fig.'6, a perspective view ofbearing-plate, andv Fig. 7 a perspective View of blade. j

Referring to the drawings, my invention, as illustrated, comprisesacrown-slittingtool or forceps having the general appearance of anordinary pair of dental forceps-'that is to say, it is provided with the-usual handle members 1 and 2, joined togetherby a pivot 3. Jaw portions4: and 5, respectively, carry an adjustable bearing-head 6 and anadjustable cutting and slitting blade 7. Bearinghead 6 has a shank 8,having annular grooves 9. Shank 8 fits into a socket 10, located in thejaw portion 4 and may be adjusted therein to various positions,asclearly shown by Figs. 2 and 3. A iat spring-plate 11, secured to thejaw 4, is provided witha pin 12, which passes through a hole in thejaWand enters one or the other ofthe annular grooves 9. The head :may beadjusted laterally by raising' the spring-plate with its pin 12. It willbe noted that the shank of the bearing-head is mounted in the jawvinsuch a manner as to freely turn therein, thereby permitting the head toassume different positions relatively to the jaw in which itis mounted.One face of the head is preferably made concave, as

ing-surface 13.

VVThe manner of mounting the adjustable cuttingorslitting .blade 7 onthe end of the jaw 'portion 5 is particularly shown by Figs. 4 and 5.Blade 7 has aV disk-shaped portion 14C, havinga'number of notches15 cutin the perimeter thereof, and is mounted on pin 16, which latter isVpassed through holes in the slotted end of the jaw 5.

A spring-plate 17, similar to plate ll, having a pin 18, is employed forlocking the blade in the desired position.

It is believed that the advantages resulting from the use of my toolover the tools heretofore designed to be used for accomplishing the samepurpose will be readily appreciated. However, I desire to especiallycall attention to the adjustable bearing-head.. and the adj ustablel'cutting or slitting blade and the manner of mounting them on the jaws.

W'hat I claim is- F 1. A dental tool for slitting capcrowns,com prisinga pair of forceps having an independently-adjustable bearing-head and anindependently-adj ustable cutting or slitting blade arranged to coperatefwiththe adjustable bearing-head, for slitting cap-crownsin theoperationv of removing cap-crowns from a tooth, substantiallyas setforth.

2. A dental tool for slitting cap-crowns,com prising a pair of forcepshaving jaw portions, one of which is provided with a socket and theother slotted,}and an adjustable bearinghead having a shank located insaid socket, an adjustable cutting or slitting blade mounted in theslottedportion of the other jaw, substantially as set forth.

3. Adental tool forslitting capcrowns,com prising a pair of jaws, anadjustable bearinghead, an adjustable cutting or slitting blade, asocket in the end of one jaw for the bearinghead, means on theotherjawfor supporting the blade, said bearing-head'provided with ashank having annular grooves and apin for engaging with said grooves',substantially as set forth. j

In testimony whereof I affix my signature in presence of two witnesses(lCLAYTON J. REYNOLDS.

Witnesses:

MILDRED E. MGGREGOR, EDWIN L. ALLEN.

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